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UPC2756TB Datasheet(PDF) 4 Page - NEC

Part No. UPC2756TB
Description  MIXEROSCILLATOR SILICON MMIC FOR FREQUENCY DOWNCONVERTER OF L BAND WIRELESS RECEIVER
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Maker  NEC [NEC]
Homepage  http://www.nec.com/
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UPC2756TB Datasheet(HTML) 4 Page - NEC

 
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Data Sheet P12807EJ2V0DS00
4
µµµµPC2756TB
6
VCC
VCC
3
4
1
VCC
PIN EXPLANATION
Pin
No.
Symbol
Assignment
Applied
Voltage
V
Pin
Voltage
V
Note
Function and Application
Equivalent Circuit
1RFin
RF input
1.2
This pin is RF input for mixer designed
as double balance type.
This circuit contributes to suppress
spurious signal with minimum LO and
bias power consumption.
Also this symmetrical circuit can keep
specified performance insensitive to
process-condition distribution.
This pin must be externally coupled to
front stage with capacitor for DC cut.
2
GND
Ground
0
Must be connected to the system
ground with minimum inductance.
Ground pattern on the board should
be formed as wide as possible.
(Track length should be kept as short
as possible.)
3
4
LO1
LO2
Local oscillator
base collector
Local oscillator
base collector
1.2
1.2
These pins are both base-collector of
oscillator. This oscillator is designed
as differential amplifier type.
3 pin and 4 pin should be externally
equipped with tank resonator circuit in
order to oscillate with feedback loop.
Also this symmetrical circuit can keep
specified performance insensitive to
process-condition distribution.
Each pin must be externally coupled
to tank circuit with capacitor for DC
cut.
5VCC
Power supply
2.7 to 3.3
Supply voltage 3.0
± 0.3 V for
operation. Must be connected bypass
capacitor (e.g. 1 000 pF) to minimize
ground impedance.
6
IF out
IF output
1.7
This pin is output from IF buffer
amplifier designed as single-ended
push-pull type.
This pin is assigned for emitter
follower output with low-impedance.
This pin must be externally coupled to
next stage with capacitor for DC cut.
Note Pin voltage is measured at VCC = 3.0 V
APPLICATION
This IC is guaranteed on the test circuit constructed with 50
Ω equipment and transmission line. This IC, however,
does not have 50
Ω input/output impedance, but electrical characteristics such as conversion gain and
intermodulation distortion are described herein on these conditions without impedance matching. So, you should
understand that conversion gain and intermodulation distortion at input level will vary when you improve VS of RF
input with external circuit (50
Ω termination or impedance matching).
External circuits of the IC are explained in a following application note.
To RF and IF port : Application Note “Usage and Application Characteristics of
µPC2757T, µPC2758T and
µPC8112T, 3-V Power Supply, 1.9-GHz Frequency Down Converter ICs for Cellular/Cordless Telephone and
Portable Wireless Communication” (Document No. P11997E)


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